Shuttle tension



E. SCHERDEL Oct. 3, 1933.

SHUTTLE TENS ION Filed Aug. 3, 1951 F153 J R as ,so

Snllentor' G, gi d Scherd 4P attorney 8 Patented Oct. 3, 1933 1 UNITEDSTATES PAT-EN SHUTTLE TENSION Egid Scherdel, Worcester, Mass, assignorvto Crompton 8a" Knowles Loom Works, Worcester, Mass., a corporation'ofMassachusetts Application August 3, 1931. Serial'No. 554,660 11 Claims.(01. 139-215) This invention relates to improvements in weft tensionsfor shuttles and it is the general object of the invention to provide ashelf-threading draw-back tension which will be capable of pulling backa large amount of weft when the shuttle comes to rest at theend of itsflight.

In certain classes of shuttles for weaving fine fabrics it is desirableto employ a pull-back tension which will take up any slack that resultsfrom the rebounding of the shuttle or the forward movement of the layafter the shuttle is boxed. This is particularly true in the use ofwefts which are relatively inelastic and also in the weaving of thosefabrics where the weft tension must remain substantially uniform. A formof tension which has gone into very extensive use is that employing aset of fixed pins for guides between which play a set of loops bent in apivoted wire. It is an important object of my invention to provide atension of this type wherein the end loop is in the form of a spiraltrap for the purpose of preventing unthreading.

' In tensons of this general class heretofore proposed the movement ofthe pivoted wire having the loops has been induced by the weft in such away that the take-up is proportional merely to the movement of the loopsbetweenthe fixed pins. It is a further important object of my presentinvention to provide the pivoted member with an actuator arm wh ch isengaged by the weft and is operative to add to the draw-back caused bythe movement of the loops with respect to the pins. In this connection Imake use of the arm to move 7 the loops into threading position. The armmay preferably move across the pathof movement of the weft as the lattermoves from one of the pins to the shuttle delivery eye, and the loopedwire is preferably though not necessarily pivoted in N that part of thetension cavity of the shuttle remote fromthe bobbin.

. With these and other objects in view whichwill appear as thedescription proceeds, my invention resdes in the combination andarrangement of parts hereinafter described and set forth I in theclaims.

In the accompanying drawing, wherein a convenient embodiment of myinvention is set forth, Fig. l is a top plan vew of one end of a shuttlemade according to my invention with the weft as it appears on the firstpick after transfer,

. Fig. 2 is a view similar to Fig. 1, but with the weft shown asthreaded through the delivery eye on the return pick after tran'sfenjFig. 3 is a vertical section on line 3-3 of Fig. 2,

- and Fig. 4 is a perspective view of the tension member and itscoacting fixed pins or posts. Referring to the drawing, the shuttle Shas weft chamber C to receive abobbin B and also a tension chamber T inwhich the subject matter .of my present invention is located. The latterchamber may be elongated in the direction of the axis of the shuttle andof appropriatedepth, and communicates with the weft chamber by athroat"10. There :'s provided in the front wall of the shuttle a delivery eye Dwhich connects at its rear end with the tension chamber T. Anappropriate cover 11 may be secured-in any man-' ner to the shuttle andextendsover a portion of the thread chamber as indicated in dot anddash" lines in Fig. 1.

There is projecting upwardly from the floorof the tension chamber apivot pin 20 around which swings a tension member or wire designatedgenerally at2l. -The latter may be formed in any way to provide abearing surrounding" the pivot and hasv a rearwardly extending finger22' attached to an elastic 23 'the'other end of which,

is anchored to the shuttle as at 24. The efiect'of the elastic is totend to hold the wire tion shown in Fig. 1. 7 1 v i The wire is formedasshown in Fig. 4 and hasupright portions 25 formed at the front of thewire. Downwardly facing hooks 26 are disposed rearwardly of the verticalportions 25. As shown in Figs; 1 and 2 there are two of these books andthere are projecting upwardly and preferably in alignment longitudinallyof'the shuttle a series: of guide pins 27, 28, 29 and 30, respectively.,One of the hooks is positioned to movebetween the pins 29,and 30 whilethe other hook moves be? tween the pins 28 and 29. The end of the wirewhich is, adjacent the throat 10 is formed of a spiral trap 31 as shownin Fig. 4, the end of, the trap toward the throat having a coil ofrelatively small diameter, while the end toward'post '28 is of 'arelatively'large; diameter. f f

That end of the wire opposite'the spiral is bent to extend forwardly andhorizontally as at 32 and then downwardly as at 33, and then upwardly toform 'a thread engaging actuator arm 34*bent; to define a'slight notch35. The parts are related normally'as shown in Fig.1 withthe arm Si infront of the line of pins. :1

In the threading of the shuttle during the first pick subsequent totransfer of bobbin B into the shuttle, the weft W will extendfrom thebobbin chamber through the throat 10, along the series of pins andacross the tension cham-.

i he P ber, and then over the end of the shuttle through an undercutgroove 40. On the return pick the weft will be guided under the beak 41of the plate and be directed downwardly against the upper part of arm34. The shuttle may be provided with any approved form of guide slot 42which will direct the weft toward the delivery eye D. .Asthe weft movesdown slot 42 andv into engagement with the arm 34 it assumes theposition shown in full lines in Fig. 2. During this return flight towardthe magazine the weft is attached to the selvage opposite the magazine,and

this causes the weft to pull against arm 34-. and

move the latter in a left hand direction as viewed in Figs. 1 and 2. Theouter pin orpost130" acts as a guide pin to produce a bend in the .weftas the latter leads to the arm 34. The wire is thus thrown by the weftfrom the full lineposition shown in Fig. 1 to the full line positionshown in Fig. 2.

- ThfishOQkSQPBIl' downwardly and are so formed that they slide over theweft in their movement betweenv the pins, thus causing the weft to liebetween the hooks' and the front yerticalportions 25of-the wire. Also,the spiral trap 31 moves to; aposition behind an over the weft. As thewire swings against action of the elastic, the weft which has'beenlocated in the notch 35 moves the said arm toward a line joining post orping30and the delivery eye. The tension of the weftdue to continued.travel of the shuttle willhold the wiresubstantially in thepositionshown infu ll lines in Fig. 2 until the shuttle is boxed. Shouldanyslackness resultin the weft due to .rebounding-of theshuttle orforward movement of the lay, the elastic will move the wireinacounter-clockwise direction around the pivot pin 20 toward; thedottedlineposition shown in Fig. 2. Whenzmoving to-this latter positiontheweft will begiven a zigzag course-as shown in dottedlines in Fig..2becauseof the pins and the hooksand spiral. .Inaddition, the-weft willalso be drawn towardthe right end of the-shuttle due to the factthat thenotch.35 is moved in that-direction when the hooks-move to-the dottedline position of Fig. 2. This movement of thenotch is away from:.theaforesaid line joining the guide post 30 and thedeliveryeye,and-thereforeincreases thepaththrough which the weft must pass, thusaffording additional 'take-up' or draw-back for the weft.

-It-is.f0und that the weft will pass arou nd the various convolutions ofthe spiral 31 andwillultimatelylie withinall the coils. Because -of thisfact thethread-is held against displacement with respect to the hooks.The delivery eye is so placed vertically that the tendency of the weftissto move along a-line above the bottom of-the hookstending-in this way.toprevent unloopingoftheweft with respect to the hooks. The notch 35isalso preferably so related to the spiral as to hold the weft'wellabove thebottomof the hooks.

. From the foregoing it will be seen that I have provided a simpleformof tension whichis preferably pivotedabout the end thereof remote-fromthebobbin chamber andhaving awire with hooks andathread trapin theformof a spiralmovable by a force communicated through an extension of-=thewire'which-engages-the weft asthe shuttle is threaded. The arm has amovement which tends to drawbackthe weft when the elastic i lower endsofthe'hooks.

Having thus described my invention it will be seen that changes andmodifications may be made therein by those skilled in the art withoutdeparting from the spirit and scope of the invention and I do not wishto be limited to the details herein disclosed, but what I claim is:

.1. In a self-threading weft tension and weft pull-back for a shuttlehaving a delivery eye, a plurality of spaced weft engaging posts fixedto the shuttle, and two weft engaging elements secured to each other and'movable about a pivot fixed on the shuttle, one of said elements havingspaced thread engaging members to become engaged and threaded. with theweft at points between the pins, and the other element normally in"thread engaging position when the members are out of threading positionto engage the weft asthelatter moves toward the delivery eye to move theother element to threading position, and yielding means to move bothelements in a direction toexertdraw-back tension on the weft.

2. In a self-threading shuttle tension and weft;

pull-back for a shuttle having. weft and tension chambers and-a deliveryeye, a pluralityof spaced weft; engaging postsfixed in the shuttle,elements each to engage-and tension the weft and located in the tensionchamber, means normally to hold one of the elements spaced from thepins, the other element being positioned to engage. the weft while thefirst element is spaced from and out of threading relation with respectto the pins as the weft moves toward the delivery eye to move the firstelement toward the pins to cause said first element to become threadedwith the weft, said'means effectiveto move each'element in a directionto take up slack-in the weft- 3. In a self-threading weft tension andweft pull-back for a shuttle having a delivery eye, a plurality ofspaced weft engaging posts fixed to the shuttle, a resilient element,and a swinging member movable against action of the element and havingtwo parts each to tension and pull back the weft, one part extendinginto the path of the weft while theother part is out of the path.

of the-weft and effective to move the other part towardthe posts byaforce derived from the weft, and the other parthaving provision for.engaging the weft between the posts when said first partis moved by theweft, the resilient element to move said other part away from the postsandv the first part against the weft to tension andpull back the weft.

4. In a self-threading shuttle, a delivery eye 5. In a self-threadingshuttle, a delivery eye' for the weft, a series of spaced pins, amovable tensioning member having a hook and'an'actuating element, theelement normally positioned to be engaged by a weft extending from a pinto the eye and effective when so engaged to move the hook toward thepins by a force derived from 'the weft to cause said hook to engage theweft at a point between the pins; and means to move the member to causeboth the hook and elementto cooperate with the pins to take up slackinthe Wef 6. In a self-threading shuttle, a delivery eye for the weft, aseries of spaced pins, a movable tensioning member having a hook and anactuating element, the element normally positioned to be engaged by aweft extending from a pin to the eye and effective when so engaged tomove the hook toward the pins by a force derived from the weft to causesaid hook to engage the weft at a point between the pins, and means tomove the member to cause the hook to coact with the pins and the elementwith one pin and the eye to take up slack in the weft.

'7. In a self threading shuttle, a delivery eye for the weft, a seriesof spaced pins, a movable tensioning member having a spiral thread trapand an actuating element and a hook between the trap and element, theelement positioned to be engaged by the weft and moved by a forcederived from the latter to move the trap and hook toward the pins,causing the trap and hook to engage the weft at points spaced from thepins, and yielding means to move the member to cause the trap, hook andelement to cooperate with the pins and take up slack in and tension theweft.

8. In a self-threading shuttle, a delivery eye for the weft, a series ofspacedpins, a movable tensioning member having a spiral thread trap andan actuating element and a hook between the trap and element, theelement positioned to be engaged by the Weft and moved by a forcederived from the latter to move the trap and hook toward the pins,causing the trap and hook to engage the weft at points spaced from thepins, and yielding means to move the member to cause the trap, hook andelement to cooperate the weft, the hook extending on both sides of aline joining the trap and the part of the element normally engaged withthe Weft.

9. In a self-threading shuttle, a delivery eye for the weft, a series ofspaced pins, a movable tensioning member having a spiral thread trap andan actuating element and a hook between the trap and'element, theelementpositioned to be engaged by the weft and moved by a force de-.rived from the latter to move the trap and hook toward the pins, causingthe trap and hookto engage the weft at points spaced from the pins, andyielding means to move the member to cause the trap, hook and element to-co-operate with the pins and take up slack in and tension the weft, thehook extending below a line joining the trap and the part of the elementnormally engaged with the weft.

10. A tension element for the self-threading shuttle comprising a singlepiece of wire having a spiral trap at one end and an actuator arm at theother end and havingca bearing and also a hook intermediate the trap andarm, the arm having a notch and the hook extending on both sides of aline joining the notch and trap.

11. A tension element for the self-threading shuttle comprising a singlepiece of wire having a spiral trap at one end and an actuator arm at theother endand having a bearing and also a hook intermediate the trap andarm, the arm having a notch and the hook extending below a line joiningthe notch and trap.

EGID SCHERDEL.

with the pins and take up slack in and tension

